Oops, it doesn't look like 'slinky dog day' is a national day..

Other days

slime

Slime Day
bonang

Bonang Day
ask out your crush

Ask Out Your Crush Day
nae nae

Nae Nae Day
lumpy rug

Lumpy Rug Day
brow

Brow Day
law

Law Day
pumpkin

Pumpkin Day
self care

Self Care Day
kale

Kale Day